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3. Empty the associated tank, then refill with a known quantity of fuel using the refuel truck meter or transfer fuel from a tank with an operative fuel quantity indicator.
4. For a flight not requiring additional fuel, the FMC CALCULATED fuel quantity recorded at the end of the previous flight may be used to determine total fuel quantity. The fuel quantity in the affected tank may then be determined by subtracting the fuel in the tanks with functional indicators from the FMC CALCULATED fuel quantity recorded.
OPERATIONS (O)
If center tank fuel is to be used:
1. Ensure that gross weight and fuel limitation have been satisfied.
A. Adjust the Zero Fuel Weight on the Airplane by including the weight of Center Tank fuel, or the Maximum Zero Fuel Weight by subtracting the weight of Center Tank fuel.
2. Fuel configuration should be all operable fuel boost pumps ON and crossfeed selector OPEN until center tank pumps are selected OFF per AFM fuel usage procedures.
3. When center tank pumps are selected OFF, position crossfeed selector CLOSE.
B757 - 200 MINIMUM EQUIPMENT LIST
EICAS STATUS MESSAGES
None
PLACARD
As appropriate
MAINTENANCE (M)
1. Open and collar the inoperative FUEL CROSSFEED valve circuit breaker (AFT FUEL CROSSFEED VALVE or FWD FUEL CROSSFEED VALVE) on the P11 panel.
2. Gain access to the inoperative fuel crossfeed valve actuator through the main landing gear wheel well (AMM 28-22-00). The actuators are located on the aft face of the center tank rear spar.
3. Rotate inoperative valve manual override lever to the closed position.
4. Lockwire the inoperative valve lever in the closed position.
5. Remove, cap and stow the electrical connector.
6. Position observer on an elevated platform at the operative crossfeed valve as required.
7. Provide electrical power.
8. At fuel control panel on overhead flight deck panel, position the operative CROSSFEED valve switch on (bar in view) and then off.
9. In the wheel well, observe that valve actuator manual override lever moves from closed position to open, and then back to closed.
10. Repeat steps 8 and 9 several times to confirm valve operation.
OPERATIONS (O)
During the last hour of flight on all ETOPS Operations, exercise the operative valve per the following:
1. Select the crossfeed valve switch ON. Verify VALVE light illuminates and then extinguishes.
2. Select the crossfeed valve switch OFF. Verify VALVE light illuminates and then extinguishes.
B757 - 200 MINIMUM EQUIPMENT LIST
REPAIR INTERVAL
ITEM
28-22-5 Automatic Shut Off
System C
C
C
EICAS STATUS MESSAGES
None
PLACARD
Center tank pump switch(es) as appropriate - L(R) AUTO SHUT OFF INOP
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本文链接地址：757 最低设备清单 Minimum Equipment List (MEL) 2(12)
